Relay.



L No. 896,809. YPATENTED AUG.25,-19.0'8.

F. L. awson; I

RELAY.

APPLICATION IIIJ ED MAY 17, 1906. RENEWED FEB. 21, 1908.

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Nol 896,809. PATENTED' AUG. 25, 1908..

P L. DODGSON. RELAY.

' APPLICATION FILED MAY 17, 1906. RENEWED FEB. 21, 1908.

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FRANK LEMONT- Dons-senor BUFFALO, NEW YORK.

RELAY;

Specification of Letters Patent.

Patented Aug. 25, 1908,.

' 7 Application filed m 17, race, Serial n. 317,269@ Renewed February 21. 19cc. Serial No. 417,089.

To jail whom it may concern:

Y'Be it known that 'I, FRANKLEMON Donose zs, a citizenof theUnited States, residing at-Bilfialo, in th county of Erie and State of New.York, have invented a new and useful preeement in Relays, of whichthe followis a specification. 4. p

My isivent'on relates torelays, and more samissy to relays of the polarized type employed'in railway switchingand signaling systems. I

The-object of myinvention is to provides polarized relay in which certainty of action'is:

msnred and in which the loss of magnetic energy isreclucedto; the minimum.

Referring to thedrawings herewith, Figure tie a side elevation, partly in section on the;

axis of one of the magnet coils. Fig. 2 is a horizontal section on the line mof Fig. 1.

Fig. 3 is a side elevation of one of my permanent magnets, myswlngln contact arm and contacts. 4 is an. end elevation of the;

contact arm and contacts.

I descrihe' therelay propen the drawings I have shown a two ann, iouri contact relay. The housing or the apparatus I.

is made up of a. ease-plate 1, a carrying-plate 2, and a surrounding glass or other non con ducting body 3. The 'eripheries of the body 3 are seated within. es on the plates 1 and,.2, and the parts are held together by screws 4. With the use of'water-proof cement the housing afiordsa damprproof chamber for theworking' arts of the relay.

' The magnet cores are ma e up ofcylindrical hodies 5' and rectangular shaped and encores. H armature 12 are contact arms 14, wmch,- 55

largcd ends 6 and 7. Thebodies 5 of the cores fit snugly through holes in the carrying- I plate 2 and are secured to it by screws 6, 7

(see-Fig. 2) ass thro h said late and threaded intii thie l ectang glar ends 6 and 7 on two diametrically p osite corners. The windings8 and the shells 9 are slipped over the cores and held down firmly by the binding-po'st yoke 10, which, in turn, is held down by nuts 1 1 threaded to the upper ends of the "cores 5. The yoke 10 carries the bindingposts for the circuit of the magnets.

} 12 is an armature common to both magnet cores. This armatureis ivotally secured to lugs13 which are secure to the plate Mounted with but insulated from the when the ets are denergizedmake electrical connectionwith the hack contacts;

- 2,,and faces the rectangular ends'6 and 7 oiifithe 1 the right hand is of the 15 which are electrically connected with bindingosts l9 and 22; and'which, in the energizer state of the :magnets, makeelectrical connection with the contacts 16, which are electrically connected with the bindinggposts 18 and 21.

nect with thebinding-posts Hand 20, which are connected with their respective contact The in-leading'wires conarms 14 by flexible conductors 18. Having thus indicated the parts and general constructionof the relay proper, i will now de scribc the features of my invention. Plrotally mounted between the poles 6 and 7 Eamon-magnetic arm 2-7. The pivots ct this arm are-carried by a lug on the plate 2,

shownin broken'outline in Fig. 1 and by a 2 pie te 36 which is secured to lugs on the plate 2. The arm 2'7 hasthus a limitedmotion in rot'ationin a horizontal plane. 'Rigidly secured to this plate 27 are permanent magnets 28. and 29. These magnets are horse-shoe shaped, or, perhaps more properly rectangular in form, the inner rectangular area being sli excess 05' the cross section of the fp'o ep ecesf 6" and 7 to permit of sufiicient swing of the arm 27. At one end of the arm- 27 secured an insulating piece 31 and secured-to this piece 31 are contact brushes 32 and'34 insulated from each other.

'23 and 2 4 are contacts connecting with binding-posts on the carrying-plate 2. These contacts 23' and 24 and the contact brushes -32 and 34 erase-positioned that when the arm 27 is swung in one direction the brush 32 make'ele'ctrical connection with the C011.-

tact 23 and the brush 34 will make electrical connection with the contact 24; and when the arm 27 is swung in the other direction the brush 32 will make electrical connection with the contact 24 and the brush 34 with the contact23. From a binding-post 25 a flexible conductor 33 connects with the contact brush 32, and from a binding-post 26 a flexible conductor 35 connects with the'con-- tact' brush 34.

The most important feature of myinvention is the means whereby I effect the movement of the arm 27. The permanent magnets are so arranged as regards their polarity that like poles of both magnets are on the same side of the pole pieces of the electro magnet: that is to say, referring to Fig. 2, if rmanent magnet 28 is a positive po c then t e right hand leg of the permanentmagnet 29 would be a positivepolez. and naturally the left hand leg of both magnets would be negative poles Suppose now that current is flowing through eleetromagnet in the direction which would make the pole piece 6 of negative polarity and the pole piece 7 of positive polarity; the right hand leg of the permanent magnet '28 would therefore be attracted toward the pole piece 6, and likewise the left hand leg of permanent magnet 29 would be attracted toward pole piece 7, and further, the left hand leg of permanent magnet 28 would be. re-

elled from pole-piece 6 and the right hand eg of magnet 29 would be repelled from pole piece 7. The whole tendency therefore of the magnetic effect is to rotate the two permanent magnets in a counter clock-wise direction. If now the current in the electro magnet is reversed so that pole piece 6 becomes a positive polarity and pole piece 7 negative polarity, the direction of all four poles of the permanent magnets would be reversed and the tendency would be to rotate in the clock-wise direction. Of course every energization of the magnets, whichever direction of fiow may occur in the coils 8, will lift the armature 12 and establish the circuit of the front contacts through the binding posts 18 and 21. By this method of construction and arrangement of the permanent magnets about the magnet poles, leakage and loss of magnetic energy-1n previous constructions a serious d1fliculty1s practically eliminat d.

Moreover, I hereby attain in a polarized relay the same advantages of construction which exist in my relay, above referred to, namely: symmetrical arrangement, increased. magnetic efficiency, and supporting all of the Working parts on a single plate and housing the same and at the same time permitting of removal and replacement of the magnet coils without disturbance of the adjustment of the working parts.

Having thus described my invention, what I claim is:

1. In combination with an electromagnet, two permanent magnets pivoted so as to swing in a plane at right angles to the cores of the electro-magnet, and having their polarity so arranged that the magnetic effect of all four poles tends to rotate them in the same direction.

2. In combination with an eleetro-magnet, a neutral armature, two permanent magnets carried by said armature, pivots carrying said armature and permanent magnets so that said permanent magnets swing in a plane at right angles to the cores of the electro-magnet, said permanent magnets having their polarity so arrangedthat the magnetic effect of all four poles tends to rotate them in the same direction.

In testimony whereof, I have hereunto set my hand in the presence of two witnesses.

FRANK LEMONT DODGSON.

itnesses A. S. KENYoN, ISAAC R. NOBLE. 

